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Schematic representation of a nanoparticle in a stationary fluid medium in a circular vessel (not to scale). Diameter of the vessel: D = 2R = 5 μm; length of the vessel: L = 10 μm; diameter of the nanoparticle: d = 2a = 100 or 500 nm; viscosity of the fluid: μ = 10−3 kg/ms; density of the fluid and the nanoparticle: ρ(f) = ρ(p) = 103 kg/m3. Particle locations away from the center are not displayed in this figure.
